package com.generate.tools.service;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Date;

public class GenerateEntityOracle implements IMaster {

	private String packageOutPath = "com.user.entity";// 指定实体生成所在包的路径
	private String authorName = "huaxp_cn@163.com";// 作者名字
	private String tablename = "emp";// 表名
	private String[] colnames; // 列名数组
	private String[] colTypes; // 列名类型数组
	private int[] colSizes; // 列名大小数组
	private boolean f_util = false; // 是否需要导入包java.util.*
	private boolean f_sql = false; // 是否需要导入包java.sql.*

	/*
	 * 构造函数
	 */
	public void generate(Connection conn) {
		// 查要生成实体类的表
		String sql = "select * from " + tablename;
		Statement pStemt = null;
		try {
			pStemt = (Statement) conn.createStatement();
			ResultSet rs = pStemt.executeQuery(sql);
			ResultSetMetaData rsmd = rs.getMetaData();
			int size = rsmd.getColumnCount(); // 统计列
			colnames = new String[size];
			colTypes = new String[size];
			colSizes = new int[size];
			for (int i = 0; i < size; i++) {
				colnames[i] = rsmd.getColumnName(i + 1);
				colTypes[i] = rsmd.getColumnTypeName(i + 1);
				if (colTypes[i].equalsIgnoreCase("date")
						|| colTypes[i].equalsIgnoreCase("timestamp")) {
					f_util = true;
				}
				if (colTypes[i].equalsIgnoreCase("blob")
						|| colTypes[i].equalsIgnoreCase("char")) {
					f_sql = true;
				}
				colSizes[i] = rsmd.getColumnDisplaySize(i + 1);
			}

			String content = parse(colnames, colTypes, colSizes);

			try {
				File directory = new File("");
				// System.out.println("绝对路径："+directory.getAbsolutePath());
				// System.out.println("相对路径："+directory.getCanonicalPath());
				String path = this.getClass().getResource("").getPath();

				System.out.println(path);
				System.out.println("src/?/"
						+ path.substring(path.lastIndexOf("/com/",
								path.length())));
				// String outputPath = directory.getAbsolutePath()+
				// "/src/"+path.substring(path.lastIndexOf("/com/",
				// path.length()), path.length()) + initcap(tablename) +
				// ".java";
				String outputPath = directory.getAbsolutePath() + "/src/"
						+ this.packageOutPath.replace(".", "/") + "/"
						+ initcap(tablename) + ".java";
				FileWriter fw = new FileWriter(outputPath);
				PrintWriter pw = new PrintWriter(fw);
				pw.println(content);
				pw.flush();
				pw.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			// try {
			// con.close();
			// } catch (SQLException e) {
			// e.printStackTrace();
			// }
		}
	}

	/**
	 * 功能：生成实体类主体代码
	 * 
	 * @param colnames
	 * @param colTypes
	 * @param colSizes
	 * @return
	 */
	private String parse(String[] colnames, String[] colTypes, int[] colSizes) {
		StringBuffer sb = new StringBuffer();

		// 判断是否导入工具包
		if (f_util) {
			sb.append("import java.util.Date;\r\n");
		}
		if (f_sql) {
			sb.append("import java.sql.*;\r\n");
		}
		sb.append("package " + this.packageOutPath + ";\r\n");
		sb.append("\r\n");
		// 注释部分
		sb.append("   /**\r\n");
		sb.append("    * " + tablename + " 实体类\r\n");
		sb.append("    * " + new Date() + " " + this.authorName + "\r\n");
		sb.append("    */ \r\n");
		// 实体部分
		sb.append("\r\n\r\npublic class " + initcap(tablename) + "{\r\n");
		processAllAttrs(sb);// 属性
		processAllMethod(sb);// get set方法
		sb.append("}\r\n");

		// System.out.println(sb.toString());
		return sb.toString();
	}

	/**
	 * 功能：生成所有属性
	 * 
	 * @param sb
	 */
	private void processAllAttrs(StringBuffer sb) {

		for (int i = 0; i < colnames.length; i++) {
			sb.append("\tprivate " + sqlType2JavaType(colTypes[i]) + " "
					+ colnames[i] + ";\r\n");
		}

	}

	/**
	 * 功能：生成所有方法
	 * 
	 * @param sb
	 */
	private void processAllMethod(StringBuffer sb) {

		for (int i = 0; i < colnames.length; i++) {
			sb.append("\tpublic void set" + initcap(colnames[i]) + "("
					+ sqlType2JavaType(colTypes[i]) + " " + colnames[i]
					+ "){\r\n");
			sb.append("\tthis." + colnames[i] + "=" + colnames[i] + ";\r\n");
			sb.append("\t}\r\n");
			sb.append("\tpublic " + sqlType2JavaType(colTypes[i]) + " get"
					+ initcap(colnames[i]) + "(){\r\n");
			sb.append("\t\treturn " + colnames[i] + ";\r\n");
			sb.append("\t}\r\n");
		}

	}

	/**
	 * 功能：将输入字符串的首字母改成大写
	 * 
	 * @param str
	 * @return
	 */
	private String initcap(String str) {
		char[] ch = str.toCharArray();
		if (ch[0] >= 'a' && ch[0] <= 'z') {
			ch[0] = (char) (ch[0] - 32);
		}

		return new String(ch);
	}

	/**
	 * 功能：获得列的数据类型
	 * 
	 * @param sqlType
	 * @return
	 */
	private String sqlType2JavaType(String sqlType) {

		if (sqlType.equalsIgnoreCase("binary_double")) {
			return "double";
		} else if (sqlType.equalsIgnoreCase("binary_float")) {
			return "float";
		} else if (sqlType.equalsIgnoreCase("blob")) {
			return "byte[]";
		} else if (sqlType.equalsIgnoreCase("blob")) {
			return "byte[]";
		} else if (sqlType.equalsIgnoreCase("char")
				|| sqlType.equalsIgnoreCase("nvarchar2")
				|| sqlType.equalsIgnoreCase("varchar2")) {
			return "String";
		} else if (sqlType.equalsIgnoreCase("date")
				|| sqlType.equalsIgnoreCase("timestamp")
				|| sqlType.equalsIgnoreCase("timestamp with local time zone")
				|| sqlType.equalsIgnoreCase("timestamp with time zone")) {
			return "Date";
		} else if (sqlType.equalsIgnoreCase("number")) {
			return "Long";
		}

		return "String";
	}

	/**
	 * 出口
	 * @param args
	 */
	public static void main(String[] args) {

		new GenerateEntityOracle();

	}

}
